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  4. Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is

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Q. Assuming $2s-2p$ mixing is $NOT$ operative, the paramagnetic species among the following is

JEE AdvancedJEE Advanced 2014Chemical Bonding and Molecular Structure

Solution:

Assuming that no $2 s -2 p$ mixing takes place
(A) $Be _{2} \rightarrow \sigma s ^{2}, \sigma^{*} 1s ^{2}, \sigma 2 s ^{2}, \sigma * 2 s ^{2}$ (diamagnetic)
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